The effects of bed roughness on the distribution of turbulent intensities in open-channel flow
作者:
Jinjun Wang,
Zengnan Dong,
Changzhi Chen,
Zhenhuan Xia,
期刊:
Journal of Hydraulic Research
(Taylor Available online 1993)
卷期:
Volume 31,
issue 1
页码: 89-98
ISSN:0022-1686
年代: 1993
DOI:10.1080/00221689309498862
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
In this paper, the systematic longitudinal turbulent intensity measurements of flow in a gravel open-channel have been conducted with a highly accurate one-dimensional LDA-system. The channel bed was roughened with gravels of uniform and non-uniform diameters respectively, and a wide range of H /Ks were considered. In comparison with the smooth bed results, it was found that the bed roughness makes the flow turbulence become well-distributed in the region near the bed and in the case of small H jK% values. With regard to the flow over a non-uniform gravel bed, only the flow region below the maximum gravels is affected by the rough bed, and outside this region, the turbulent intensity distributions could collapse on to a single curve.
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